✔ 最佳答案
(1/2)(5x - 1) - (2/3)(4x - 2)
= (5x - 1)/2 - [2(4x - 2)]/3
= (3/3)[(5x - 1)/2] - (2/2)[(2*4x - 2*2)]/3]
= [3(5x - 1)]/6 - [2(8x - 4)]/6
= (3*5x - 3*1)/6 - (2*8x - 2*4)/6
= (15x - 3)/6 - (16x - 8)/6
= (15x - 3 - 16x + 8)/6
= (15x - 16x - 3 + 8)/6
= (-x + 5)/6